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DIN 7981
Form C, with drilling tip

*All measurements in millimeters (mm)*

d k max d1 max r1 approx Cross recess No.
2.2 1.8 4.2 3.4 H1
2.9 2.2 5.6 4.4 H1
3.5 2.6 6.9 5.4 H2
3.9 2.8 7.5 5.8 H2
4.2 3.05 8.2 6.2 H2
4.8 3.55 9.5 7.2 H2
5.5 3.95 10.8 8.2 H3
6.3 4.55 12.5 9.5 H3
8 5.25 15.8 - -

All information is strictly informative